are included within the Scutiljranchs ; of this latter number about 40 belong to 

 the Chitonida? and the same number to the Trochidie. 



Of the 247 marine gasteropods enumerated by the late Dr. Stimpson in the 

 Smithsonian Institution Check-list, as found from the Arctic Seas to Georgia, 

 32 only, or less than one-eighth, come within the Order mentioned ; of this 

 comparatively small number seven (7) are Chitons and fourteen (14) belong to 

 the Trochlda, while Ihliotisf is without a representative; the Tiochida with- 

 in this province are not represented by such marked or unique characters as 

 distinguish their relatives on the West Coast. 



Some revision may be required hereafter in the number of Scutibrancliiate 

 species credited to the West coast province, as forms now catalogued as dis- 

 tinct may in some instances be united ; but on the other hand, it is not unlikely 

 that new forms undoubtedly distinct will be detected when the coast is more 

 thoroughly explored. 



tA solitary specimen of Haliotis, of small size, was obtained through dredging in the 

 Gulf Stream, four or live years ago, by Count L. F. Pourtales, of the U. S. Coast Siwvey, b>it 

 south of Georgia. 



